Enhancing Performance of LiFePO<sub>4</sub> Battery by Using a Novel Gel Composite Polymer Electrolyte
Ke Wu,
Naiqi Hu,
Shuchan Wang,
Zhiyuan Geng,
Wenwen Deng
Affiliations
Ke Wu
Institute of Materials Science & Devices, School of Material Science and Engineering, Suzhou University of Science and Technology, Suzhou 215000, China
Naiqi Hu
Institute of Materials Science & Devices, School of Material Science and Engineering, Suzhou University of Science and Technology, Suzhou 215000, China
Shuchan Wang
Institute of Materials Science & Devices, School of Material Science and Engineering, Suzhou University of Science and Technology, Suzhou 215000, China
Zhiyuan Geng
Institute of Materials Science & Devices, School of Material Science and Engineering, Suzhou University of Science and Technology, Suzhou 215000, China
Wenwen Deng
Institute of Materials Science & Devices, School of Material Science and Engineering, Suzhou University of Science and Technology, Suzhou 215000, China
Composite polymer electrolyte (CPE) is expected to have great prospects in solid-state batteries. However, their application is impeded due to the poor interfacial compatibility between CPE and electrodes that result in sluggish ionic transformation, especially at low temperatures. Here, on the basis of Poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) polymer electrolyte, gel composite polymer electrolyte (GCPE) with fast Li+ transport channel is prepared by in-situ polymerization with poly (ethylene glycol) methyl ether acrylate (PEGMEA) monomer and FEC as additive. Compared with CPE, GCPE increases the ionic conductivity by 10 times. It also achieves more uniform lithium precipitation and significantly inhibits the growth of lithium dendrites. The LFP/GCPE/Li battery has a capacity retention of over 99% at both room temperature and 0 °C after 100 cycles. In addition, the coulombic efficiency is above 99% during cycling. Our work provides a new technology to prepare GCPE with high ionic conductivity at both room temperature and low temperatures that has great potential in the application of solid-state lithium batteries.
